Zero-belt moisture removal type brake

Abstract

The invention relates to a zero-band wet-exhausting type brake which comprises a brake shell, a clutch shell and a rear shell, a driving gear hub is connected in the brake shell, a transmission shaft is connected in the clutch shell, a driven gear hub is arranged on the transmission shaft in a sliding mode, a friction plate assembly is arranged on the transmission shaft in a sliding mode, and a first elastic unit and a piston are arranged in the brake shell in a sliding mode. The first oil inlet leads to a piston cavity of the piston; a service brake piston is embedded in the left end of the rear shell, and a piston cavity of the service brake piston communicates with the second oil inlet. A parking piston is slidably connected into the rear shell, the right side of the parking piston is connected with a second elastic unit, a push-pull shaft axially penetrates through the transmission shaft and the parking piston, the left end of the push-pull shaft is in bearing connection with a driven gear hub, and hydraulic oil can enter from a third oil inlet to push the parking piston and the push-pull shaft to retreat. According to the invention, the parking piston is separated from the transmission shaft, and the driving gear hub is separated from the driven gear hub, so that the external transmission shaft is not mechanically connected with the friction plate assembly, and zero belt displacement torque is realized.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a zero-belt wet-dissipation brake. Background Art

[0002] Wet brakes are a type of braking device widely used in construction machinery, mining equipment, agricultural machinery, and special vehicles. Their core feature is the immersion of the brake pads in oil, which cools and lubricates the brakes, significantly reducing heat and wear during braking. Compared to traditional dry brakes, wet brakes offer advantages such as improved heat dissipation, a long service life, and adaptability to harsh environments. However, due to the inherent dissipation of wet brakes, even when the brake pads are not engaged, there is still a significant dissipation torque. This dissipation torque can cause the brakes to heat up and increase power loss, making it unsuitable for new energy vehicles. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem that a wet brake has a large belt-discharge torque and to provide a zero-belt-discharge wet brake.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A zero-belt wet-discharge brake comprises a brake housing, a clutch housing, and a rear housing which are fixedly connected in sequence from left to right. The brake housing is provided with a first oil inlet, and the rear housing is provided with a second oil inlet and a third oil inlet in sequence from left to right.

[0006] A driving gear hub is installed in the brake housing via a bearing;

[0007] A transmission shaft is installed in the clutch housing through a bearing, a passive gear hub is slidably provided on the left end of the transmission shaft along its axial direction, a friction plate assembly is slidably provided on the transmission shaft along its axial direction, a first elastic unit and a piston are slidably provided in the brake housing, the first elastic unit is arranged on the right side of the passive gear hub, and is connected to the passive gear hub through a bearing, and is used to apply thrust to the passive gear hub so that the passive gear hub engages with the active gear hub, a piston cavity for installing a piston is formed between the brake housing and the clutch housing, the piston cavity of the piston is communicated with the first oil inlet, and the right end of the first elastic unit is against the piston;

[0008] A service brake piston is embedded in the left end of the rear housing, and the service brake piston is fixedly connected to a push plate, which is arranged between the friction plate assembly and the service brake piston. A piston cavity is provided on a side of the service brake piston away from the push plate, and the piston cavity of the service brake piston is connected to the second oil inlet;

[0009] A parking piston is axially slidably connected in the rear shell, and a second elastic unit is connected to the right side of the parking piston. Both ends of the second elastic unit respectively abut against the parking piston and the rear shell, and are used to apply thrust to the parking piston to connect the parking piston with the transmission shaft. A push-pull shaft is axially passed through the transmission shaft and the parking piston, and the left end of the push-pull shaft is connected to the passive gear hub through a bearing. A piston cavity of the parking piston is formed between the parking piston and the push-pull shaft, and the parking piston has a radial through hole. Hydraulic oil enters between the rear shell and the push-pull shaft and between the push-pull shaft and the parking piston through the third oil inlet and the radial through hole, thereby pushing the parking piston and the push-pull shaft backward.

[0010] In some embodiments, the first elastic unit includes a parking pressure plate and a first spring, the parking pressure plate is slidably arranged in the brake housing through a spline, the parking pressure plate is connected to the passive gear hub through a first thrust bearing, the clutch housing has an extension portion extending toward the interior of the brake housing, the extension portion and the brake housing form a piston cavity of the piston, one end of the piston can abut against the extension portion, the first spring is installed in the parking pressure plate, and the two ends of the first spring respectively abut against the parking pressure plate and the piston.

[0011] In some embodiments, when the parking piston is connected to the transmission shaft through the thrust of the second elastic unit, the parking piston is axially slidably connected to the transmission shaft through an internal spline.

[0012] In some embodiments, the rear shell includes a rear shell end cover and a retaining ring, and the end cover and the retaining ring are installed on the rear shell through a hole using a retaining ring.

[0013] In some embodiments, a pull rod and a forced unlocking nut are also included. One end of the pull rod is connected to the forced unlocking nut through a thread, and the other end is clamped in the waist-shaped hole of the push-pull shaft through a pin, and the pin part is clamped in the groove of the end cover.

[0014] In some embodiments, the push-pull shaft is clamped in the groove of the end cover through the pin, the pin is clamped in the waist-shaped hole of the push-pull shaft, the inner ring of the retaining ring is clamped in the notch groove of the end cover, and the outer ring is clamped in the groove of the rear shell.

[0015] In some embodiments, the second elastic unit is a second spring, and the second spring is installed between the parking piston and the end cover.

[0016] In some embodiments, the parking piston includes a first piston portion and a second piston portion, the first end of the first piston portion is arranged toward the transmission shaft, the second end of the first piston portion is fixedly connected to the first end of the second piston portion, the second elastic unit is against the second end of the second piston portion, the radial through hole is arranged between the first piston portion and the second piston portion, and the diameter of the first end of the second piston portion is larger than the diameter of the second end of the first piston portion.

[0017] In some embodiments, the passive gear hub is slidably mounted on the left end of the transmission shaft along its axial direction via a spline, and the friction plate assembly is slidably mounted on the right end of the transmission shaft along its axial direction via a spline.

[0018] In some embodiments, the parking piston is slidingly mounted on the rear housing via external splines.

[0019] The present invention has the following beneficial effects:

[0020] The present application sets a first oil inlet on the brake housing and a second and third oil inlet on the rear housing, thereby enabling the wet brake to be in different working states by controlling the engagement of the passive gear hub and the active gear hub, the combination of the push plate and the friction plate assembly, and the combination of the parking piston and the transmission shaft through hydraulic oil. When in a state of no braking force, the parking piston is disengaged from the transmission shaft, and the push-pull shaft retracts to pull the passive gear hub to disengage the active gear hub and the passive gear hub. At this time, since the active gear hub and the passive gear hub are disengaged, there is no mechanical connection between the external transmission shaft and the friction plate assembly, achieving zero belt displacement torque, avoiding heat generation of the brake due to belt displacement torque, and reducing power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a wet brake in a parking state according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the wet brake structure in a zero-displacement and no-braking-force state according to an embodiment of the present invention;

[0023] Figure 3 1 is a schematic structural diagram of a wet brake in a service braking state according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the wet brake structure in a forced unlocking state according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1-Actuator housing, 2-Clutch housing, 3-Rear housing, 4-Driving gear hub, 5-First bearing, 6-Passive gear hub, 7-First thrust bearing, 8-Parking pressure plate, 9-First spring, 10-Piston, 11-Transmission shaft, 12-Push-pull shaft, 13-Second thrust bearing, 14-Second bearing, 15-Friction plate assembly, 16-Service brake piston, 17-Parking piston, 18-End cover, 19-Second spring, 20-Pull rod, 21-Pin, 22-Forced unlocking nut, 25-Retaining ring, 26-Retaining ring for hole, 31-Push plate. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the present invention and its application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and coupling or communication.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0031] refer to Figure 1 A zero-belt wet-discharge brake comprises a brake housing 1, a clutch housing 2, and a rear housing which are fixedly connected from left to right. The brake housing 1 is provided with a first oil inlet, and the rear housing is provided with a second oil inlet and a third oil inlet from left to right.

[0032] A driving gear hub 4 is installed in the brake housing 1 through a bearing;

[0033] A transmission shaft 11 is installed in the clutch housing 2 through a bearing. A passive gear hub 6 is slidably provided on the left end of the transmission shaft 11 along its axial direction. A friction plate assembly 15 is slidably provided on the transmission shaft 11 along its axial direction. A first elastic unit and a piston 10 are slidably provided in the brake housing 1. The first elastic unit is arranged on the right side of the passive gear hub 6 and is connected to the passive gear hub 6 through a bearing. It is used to apply thrust to the passive gear hub 6 so that the passive gear hub 6 engages with the active gear hub 4. A piston cavity for installing the piston 10 is formed between the brake housing 1 and the clutch housing 2. The piston cavity of the piston 10 is communicated with the first oil inlet, and the right end of the first elastic unit is against the piston 10.

[0034] A service brake piston 16 is embedded in the left end of the rear housing. The service brake piston 16 is fixedly connected to a push plate 31. The push plate 31 is disposed between the friction plate assembly 15 and the service brake piston 16. A piston chamber is disposed on the side of the service brake piston 16 away from the push plate 31. The piston chamber of the service brake piston 16 is connected to the second oil inlet.

[0035] A parking piston 17 is axially slidably connected in the rear shell, and a second elastic unit is connected to the right side of the parking piston 17. The two ends of the second elastic unit respectively abut against the parking piston 17 and the rear shell, and are used to apply thrust to the parking piston 17 to connect the parking piston 17 to the drive shaft 11. A push-pull shaft 12 is axially penetrated in the drive shaft 11 and the parking piston 17. The left end of the push-pull shaft 12 is connected to the passive gear hub 6 through a bearing. A piston cavity of the parking piston 17 is formed between the parking piston 17 and the push-pull shaft 12. The parking piston 17 has a radial through hole. The hydraulic oil enters between the rear shell and the push-pull shaft 12 and between the push-pull shaft 12 and the parking piston 17 through the third oil inlet and the radial through hole, thereby pushing the parking piston 17 and the push-pull shaft 12 to retreat.

[0036] In this embodiment, there are 4 pistons in a total of 3 sets: 1. piston 10, 2. service brake piston 16, 3. parking piston 17 and push-pull shaft 12, wherein the push-pull shaft 12 is embedded in the parking piston 17; this embodiment controls three lines of hydraulic oil through the first to third oil inlets, respectively controlling the above three sets of pistons.

[0037] In this embodiment and some other embodiments, the first elastic unit includes a parking pressure plate 8 and a first spring 9. The parking pressure plate 8 is slidably mounted within the brake housing 1 via a spline. The parking pressure plate 8 is connected to the passive gear hub 6 via a first thrust bearing 7. The clutch housing 2 has an extension extending into the interior of the brake housing 1. The extension and the brake housing 1 form a piston cavity for a piston 10, with one end of the piston 10 capable of abutting the extension. The first spring 9 is mounted within the parking pressure plate 8, with both ends of the first spring 9 abutting the parking pressure plate 8 and the piston 10, respectively. In this embodiment, a second thrust bearing 13 is mounted between the push-pull shaft 12 and the passive gear hub 6.

[0038] In this embodiment and some other embodiments, when the parking piston 17 is connected to the transmission shaft 11 by the thrust of the second elastic unit, the parking piston 17 is axially slidably connected to the transmission shaft 11 through the internal spline.

[0039] In this embodiment and some other embodiments, the rear shell includes a rear shell body 3, an end cover 18 and a retaining ring 25. The end cover 18 and the retaining ring 25 are mounted on the rear shell body 3 through a retaining ring 26 through a hole.

[0040] In this embodiment and some embodiments, a pull rod 20 and a forced unlocking nut 22 are also included. One end of the pull rod 20 is connected to the forced unlocking nut 22 through a thread, and the other end is clamped in the waist-shaped hole of the push-pull shaft 12 through a pin 21. The pin 21 is partially clamped in the groove of the end cover 18.

[0041] In some embodiments, the push-pull shaft 12 is stuck in the groove of the end cover 18 by the pin 21, and there is no rotational relative movement between the push-pull shaft 12 and the end cover 18. The pin 21 is stuck in the waist-shaped hole of the push-pull shaft 12, so that the piston rod 30 can move in a straight line but cannot make rotational movement. The inner ring of the retaining ring 25 is stuck in the notch groove of the end cover 18, and the outer ring is stuck in the groove of the rear shell, so that there is no rotational relative movement between the end cover 18 and the rear shell.

[0042] In this embodiment and some other embodiments, the second elastic unit is a second spring 19 , which is installed between the parking piston 17 and the end cover 18 .

[0043] In this embodiment and some embodiments, the parking piston 17 includes a first piston portion and a second piston portion, the first end of the first piston portion is arranged toward the transmission shaft 11, the second end of the first piston portion is fixedly connected to the first end of the second piston portion, the second elastic unit is against the second end of the second piston portion, a radial through hole is arranged between the first piston portion and the second piston portion, and the diameter of the first end of the second piston portion is larger than the diameter of the second end of the first piston portion.

[0044] In this embodiment and some embodiments, the left end of the transmission shaft 11 is provided with a passive gear hub 6 through a spline sliding along its axial direction, the right end of the transmission shaft 11 is provided with a friction plate assembly 15 through a spline sliding along its axial direction, and the parking piston 17 is slidably installed on the rear shell through an external spline.

[0045] The zero-band wet brake of the embodiment of the present invention can be operated in four operating states: parking brake state, service brake state, zero-band wet brake state, and forced unlock state, depending on the working state of the hydraulic oil. The embodiment of the present invention will be described in detail below with reference to the accompanying drawings:

[0046] refer to Figure 1In the parking state, no hydraulic oil applies pressure to the piston. When the brake piston is completely free of external oil pressure, the active hub gear 4 and the passive hub gear 6 are compressed by the first spring 9. This first spring 9 applies pressure to the parking pressure plate 8, causing the active hub gear 4 and the passive hub gear 6 to engage, and the end teeth of the active hub gear 4 and the passive hub gear 6 are in an engaged state. Under the action of the second spring 19, the parking piston 17 splines the ring gear to the drive shaft 11. At this point, the external drive shaft is fixed via the active hub gear 4, the passive hub gear 6, the drive shaft 11, the ring gear, and the rear housing, achieving the parking state.

[0047] refer to Figure 2 In the zero-brake, no-braking-force state, pressure is applied to the third oil inlet of the brake. The parking piston 17 drives the ring gear back, disengaging it from the drive shaft 11. Hydraulic oil enters the cavity between the push-pull shaft 12 and the parking piston 17 through the hole in the parking piston 17, causing the push-pull shaft 12 to retract. The push-pull shaft 12 pulls the passive gear hub 6, disengaging the active gear hub 4 from the passive gear hub 6. At this time, since the active gear hub 4 and the passive gear hub 6 are disengaged, there is no mechanical connection between the external drive shaft and the friction plate assembly 15, achieving the zero-brake, no-braking-force state.

[0048] refer to Figure 3 In the service brake state, with zero displacement and no braking force, pressure is applied to the first and second oil inlets. From this state, the service brake state is activated: pressurized oil pushes piston 10, engaging driving gear hub 4 and driven gear hub 6. This oil then pushes service brake piston 16 in the rear housing, engaging friction plate assembly 15. Service braking is now achieved via the external drive shaft, which moves from driving gear hub 4 to driven gear hub 6, then to drive shaft 11, and finally to friction plate assembly 15.

[0049] refer to Figure 4 In the forced unlock state: When the vehicle cannot be started, it is in the parking brake state and cannot be hydraulically unlocked. Tightening the forced unlock nut 22 causes the pull rod 20 to drive the pin 21, the push-pull shaft 12, and the passive gear hub 6 to retract, forcibly disengaging the active gear hub 4 and the passive gear hub 6. At this point, there is no mechanical connection between the external drive shaft and the friction plate assembly 15, and the vehicle can be towed.

[0050] The above further describes the present application in conjunction with specific / preferred embodiments, and cannot be deemed to limit the specific implementation of the present application to these descriptions. For those skilled in the art to which the present application belongs, without departing from the concept of the present application, they can make several substitutions or variations to the described embodiments, and these substitutions or variations shall be deemed to fall within the protection scope of the present application. In the description of the present application, the description of the terms "an embodiment", "some embodiments", "a preferred embodiment", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the case of no mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples. Although the embodiments of the present application and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A zero-belt wet-dissipation brake, characterized in that: It comprises a brake housing (1), a clutch housing (2), and a rear housing which are fixedly connected in sequence from left to right, wherein the brake housing (1) is provided with a first oil inlet, and the rear housing is provided with a second oil inlet and a third oil inlet in sequence from left to right; A driving gear hub (4) is installed in the brake housing (1) via a bearing; A transmission shaft (11) is installed in the clutch housing (2) through a bearing, a passive gear hub (6) is slidably provided on the left end of the transmission shaft (11) along its axial direction, and a friction plate assembly (15) is slidably provided on the transmission shaft (11) along its axial direction. A first elastic unit and a piston (10) are slidably provided in the brake housing (1), the first elastic unit is arranged on the right side of the passive gear hub (6), and is connected to the passive gear hub (6) through a bearing, and is used to apply a thrust to the passive gear hub (6) so that the passive gear hub (6) engages with the active gear hub (4). A piston cavity for installing the piston (10) is formed between the brake housing (1) and the clutch housing (2), the piston cavity of the piston (10) is communicated with the first oil inlet, and the right end of the first elastic unit abuts against the piston (10); A service brake piston (16) is embedded in the left end of the rear housing, and the service brake piston (16) is fixedly connected to a push plate (31). The push plate (31) is arranged between the friction plate assembly (15) and the service brake piston (16). A piston cavity is arranged on a side of the service brake piston (16) away from the push plate (31), and the piston cavity of the service brake piston (16) is connected to the second oil inlet. A parking piston (17) is axially slidably connected in the rear shell, and a second elastic unit is connected to the right side of the parking piston (17). The two ends of the second elastic unit respectively abut against the parking piston (17) and the rear shell, and are used to apply thrust to the parking piston (17) so that the parking piston (17) is connected to the transmission shaft (11). A push-pull shaft (12) is axially passed through the transmission shaft (11) and the parking piston (17). The left end of the push-pull shaft (12) is connected to the passive gear hub (6) through a bearing. A piston cavity of the parking piston (17) is formed between the parking piston (17) and the push-pull shaft (12). The parking piston (17) has a radial through hole. Hydraulic oil enters between the rear shell and the push-pull shaft (12) and between the push-pull shaft (12) and the parking piston (17) through the third oil inlet and the radial through hole, thereby pushing the parking piston (17) and the push-pull shaft (12) backward.

2. A zero-band wet-discharge brake according to claim 1, characterized in that: The first elastic unit includes a parking pressure plate (8) and a first spring (9), wherein the parking pressure plate (8) is slidably mounted in the brake housing (1) via a spline, and the parking pressure plate (8) is connected to the passive gear hub (6) via a first thrust bearing (7), and the clutch housing (2) has an extension portion extending toward the interior of the brake housing (1), wherein the extension portion and the brake housing (1) form a piston cavity of the piston (10), and one end of the piston (10) can abut against the extension portion, and the first spring (9) is installed in the parking pressure plate (8), and both ends of the first spring (9) abut against the parking pressure plate (8) and the piston (10), respectively.

3. A zero-band wet-discharge brake according to claim 1, characterized in that: When the parking piston (17) is connected to the transmission shaft (11) through the thrust of the second elastic unit, the parking piston (17) is axially slidably connected to the transmission shaft (11) through the internal spline.

4. A zero-band wet-discharge brake according to claim 1, characterized in that: The rear shell comprises a rear shell (3), an end cover (18) and a retaining ring (25); the end cover (18) and the retaining ring (25) are mounted on the rear shell (3) via a retaining ring (26) through a hole.

5. A zero-band wet-discharge brake according to claim 4, characterized in that: It also includes a pull rod (20) and a forced unlocking nut (22), one end of the pull rod (20) is connected to the forced unlocking nut (22) through a thread, and the other end is clamped in the waist-shaped hole of the push-pull shaft (12) through a pin (21), and the pin (21) is partially clamped in the groove of the end cover (18).

6. A zero-band wet-discharge brake according to claim 5, characterized in that: The push-pull shaft (12) is clamped in the groove of the end cover (18) through the pin (21), the pin (21) is clamped in the waist-shaped hole of the push-pull shaft (12), the inner ring of the retaining ring (25) is clamped in the notch groove of the end cover (18), and the outer ring is clamped in the groove of the rear shell.

7. The zero-band wet-discharge brake according to claim 4, characterized in that: The second elastic unit is a second spring (19), and the second spring (19) is installed between the parking piston (17) and the end cover (18).

8. The zero-belt wet-discharge brake according to claim 1, characterized in that: The parking piston (17) includes a first piston part and a second piston part, wherein the first end of the first piston part is arranged toward the transmission shaft (11), the second end of the first piston part is fixedly connected to the first end of the second piston part, the second elastic unit abuts against the second end of the second piston part, the radial through hole is arranged between the first piston part and the second piston part, and the diameter of the first end of the second piston part is larger than the diameter of the second end of the first piston part.

9. The zero-band wet-discharge brake according to claim 1, characterized in that: The passive gear hub (6) is slidably mounted on the left end of the transmission shaft (11) along its axial direction via a spline, and the friction plate assembly (15) is slidably mounted on the right end of the transmission shaft (11) along its axial direction via a spline.

10. The zero-band wet-discharge brake according to claim 1, characterized in that: The parking piston (17) is slidably mounted on the rear housing via an external spline.

Images